Improvement in hot-air furnaces



JOSEPH O. BARNES, OF ALBANY, NEW YORK.

IMPROVEMENT lN HOT-AIR FURNACES.

UNITED 'rA'rns JOSEPH O. BARNES, OF ALBANY, NEW YORK.

IMPROVEMENT IN HOT-AIR FURNACES Specification forming part of LettersPatent N0.119,554, dated October 3, 1871.

To all whom it may concern:

Be it known that I, JOSEPH G. BARNES, of Albany, in the county of Albanyand State of New York, have invented a new and Improved Heater; and I dohereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawingforming part of this specification.

This invention relates to improvements in heat ers or hot-air furnaces;and it consists in an annular cold-air space surrounding the ash-pit,firepot, and combustion-chamber, which is surrounded by another annularspace into which the product of combustion is discharged between tubesconnecting an upper and a lower section of the cold-air space, and thewhole is surrounded by an outer case and comprises an arrangementcalculated to be very effective in economizing the heat.

Figure 1 is a sectional elevation, and Fig. 2 is a horizontal section ofthe same.

Similar letters of reference indicate corresponding parts.

A and A represent the cold-air annular space surrounding the ash-pit B,fire-pot G, and combustion-chamber D, to which space the cold air 1 isadmitted through the bottom when the heater stands on legs, but when itrests on the floor the, air may be admitted through an opening in theside, and the partof said chamber around the ash-pit may be dispensedwith. E is the annular space surrounding A and A into which the productof combustion is discharged between It will be seen that thisarrangement provides a very large air-heating surface; also, that thecold an is exposed to very great heat when passing through the tubes F,which are exposed to intense heat immediately above the fire-pot.

For use as an ordinary stove the outer case will be dispensed with.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent The cold-air chamber in sections A and A connected bythe tubes F surrounding the fire-pot and chamber D, and eithersurrounding the ashpit or not, and the said chamber siurounded by thechamber E, and the whole by an outer ease, I, or not, all substantiallyas specified.

The above specification of my invention signed by me this 5th day ofApril,1871.

JOSEPH (J. BARNES.

" Witnesses:-

OHAs. MoGARvnY, JOHN JOSEPH OoYLE.

